Background Technology: Ka ọ dị ugbu a, mmiri ikpe na ahịa bụ tumadi ọla kọpa ikpe, nwere ndị na-abụghị ferrous metal lead, ogologo oge ojiji ga-apụta ọla kọpa nchara, na ndu bụ na-emerụ ahụ ike mmadụ, n'ebe ugwu nke colder ebe, n'ihi na ike nke shei ọla kọpa abụghị nnukwu, fo ...
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